IE Document mode

Hi Experts,
I'm having a weird issue with our webapp. In IE, when I go to F12 view for emulation - as I switch pages in our webapp, I can see the document mode changing its default value for that page. One particular page is changing on my browser to IE7 (where JSON is not even defined), so the page is broken for me. But my colleagues IE version does not do this on the same page... How can I find what is in the same page but causing my IE to change document mode?

If you are a web developer, you would be aware of the <iframe> tag in HTML. The <iframe> stands for inline frame and is used to embed another document within the current HTML document. The embedded document could be even another website.

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